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Fan simulation with inlet and outlet duct for finding fan curve

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Old   August 6, 2014, 10:49
Default Fan simulation with inlet and outlet duct for finding fan curve
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hashim chaudhry
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Hi I am quite new to CFD i am trying to find out the fan curve. My fan diameter is 71mm and what did uptill now I made inlet duct 15 times of fan dia with pressure inlet (0.0 Pa), outlet duct 30 times of fan dia with pressure outlet (0.0 Pa) and I am giving fixed rpm to the rotating region in between. I am measuring pressure in inlet and outlet duct at a position 10 times of fan dia. but Still I didnt find the relevant pressure difference across the fan and also the solution is not converges. If i want to give the value of dynamic pressure at the inlet then how can i calculate this value as i know the flowrate.
Although I am working in the same way as hiras worked that I am using steady state solution, MRF, pressure-inlet/pressure outlet conditions, k-e standard.
I have attached the pictures of model and mesh kindly take a look and also let me know whether my geometry is correct or not

I would be very grateful if you people help me out
Attached Images
File Type: jpg model.jpg (78.6 KB, 9 views)
File Type: jpg close_view.jpg (70.6 KB, 11 views)
File Type: jpg front view.jpg (72.6 KB, 9 views)
File Type: jpg mesh.jpg (74.4 KB, 11 views)
File Type: jpg side_view.jpg (64.5 KB, 13 views)
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